GANG MODULAR JACK

Abstract: Configurations of electrical connectors (1, 2) such as modular jacks adapted to be mounted on a printed circuit having a plurality of recesses (8) located close to terminal slots (6) at both sides to rectify dimensional variation caused by plastic shrinkage, having terminal slots constructed by two V-shape protrusions (6a) at their neck area so that the round terminal part is more precisely positioned in the housing, having a flux trap (9) provided at a contact area between the plastic housing and a contact pin (5) to eliminate the wicking of the flux, and having a socket (2).

Description: GANG MODULAR JACK FIELD OF THE INVENTION The present invention generally relates to electrical connectors, and more particularly to improved configurations of modular jacks which are used for connecting a telephone set to a telephone line. BACKGROUND OF THE INVENTION Conventionally, modular jacks having fundamental parts thereof standardized in conformance with the FCC standard or the like are used to connect telephone sets to telephone lines. The modular jack of this kind generally has a box-shaped housing with a plug inserting opening on the front surface of the housing. When the telephone set is connected to the telephone line, a plug which is provided on an end of the telephone line is inserted into the plug inserting opening. A plurality of contact pins are held in the housing so that one end of each of the contact pins projects from the bottom of the housing to constitute a terminal part and the other end of each of the contact pins projects within the plug inserting opening of the housing to constitute a contact part. The modular jack is placed on a printed circuit board which is secured to a main telephone body, in such a manner that the plug inserting opening is exposed to the outside of the telephone body. The terminal part constituted by the contact pins projecting from the bottom of the housing is soldered to respective circuit patterns on the printed circuit board within the telephone body. Because of the dimensional variation of the jack caused by plastic shrinkage, the resultant position of the terminal part of a conventional modular jack is somewhat different from the nominal position as designed. For this reason, it is difficult and time-consuming to solder the terminal part of the modular jack to the printed circuit board. In addition, owing to the wicking strength induced in the contact area between the plastic housing and the contact pin, the flux migrates up along the contact pin to the contact part during fluxing and soldering processes so that the conductivity of the contact part is lowered. Furthermore, since sockets of conventional telephone sets are separate from the modular jacks where the sockets may be used as a DC power socket, antenna socket or an interface socket for another device, it is time- consuming to assemble the sockets and the modular jacks onto the telephone sets. Consequently, there is a need for practical and economical configurations of modular jacks which can overcome the disadvantages described above. SUMMARY OF THE INVENTION Accordingly, it is the general object of the present invention to provide a novel and useful configurations of modular jacks in which the problems described heretofore are eliminated. A specific object of the present invention is to provide an electrical connector in which the terminal part of a contact pin is more precisely positioned. According to a first aspect of the present invention, a plurality of recesses are located close to terminal slots at both sides to rectify dimensional variation caused by plastic shrinkage. According to a further aspect of this invention, a terminal slot is constructed by two V-shape protrusions at its neck area so that the round terminal part of the contact pin is more precisely positioned in the housing. Another specific object of the present invention is to eliminate the wicking of the flux. According to a second aspect of the invention, a flux trap is provided at the contact area between the plastic housing to eliminate the wicking of the flux. According to a third aspect of the present invention, a modular jack is integrated with a socket. These and other objects, advantages and features of the present invention will be more fully understood and appreciated by reference to the following detailed description when read in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a perspective view showing an embodiment of a modular jack in accordance with the present invention; Fig. 2 is a cross section of the modular jack shown in Figure 1 along a line II-II; Fig. 3 is a bottom view of the modular jack of the present invention; Fig. 4 is an enlarged view of a terminal slot shown in Fig. 3; and Fig. 5 is a cross section of the modular jack shown in Figure 1 along a line V-V. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Figure 1 depicts an embodiment of a modular jack in accordance with the present invention. A preferred embodiment of a modular jack of the present invention mainly comprises a housing 1, a socket 2, at least one plug inserting opening 3, two mounting legs 4 (Figure 2) , and two mounting ears 7. The housing 1 in the preferred embodiment is made of formed plastics and is provided with a plug inserting opening 3 on the front surface thereof to receive a plug provided at the one end of a telephone line. A plurality of slots 6 are formed on the upper surface and the bottom surface of the housing 1. These slots 6 are disposed in parallel relationship to each other for accommodating contact pins 5. Figure 2 is a cross section of the modular jack along a line II-II in Figure 1, showing the structure of the plug inserting opening 3 and the contact pins 5. The modular jack is provided with several contact pins 5, each of which runs within a channel in the housing 1. Each contact pin 5 is held firmly within the channel and the slot 6. One end of a contact pin 5 projects from the bottom of the housing 1 to constitute a terminal part 5a for electrically conducting with a printed circuit board and the other end of a contact pin 5 projects within the plug inserting opening 3 of the housing 1 to constitute a contact part 5b for electrically conducting with the plug provided at one end of the telephone line. When the modular jack is ..mounted onto the printed circuit board by soldering, the flux, owing to the wicking strength induced in the contact area between the plastic housing and the contact pin, migrates up along the contact pin 5 to the contact part 5b during fluxing and soldering processes so as to lower the conductivity of the contact part 5b. According to an embodiment of a modular jack of the present invention, the a cavity 9 is defined in the contact area between the plastic housing and the contact pin to function as a flux trap. The cohesion force of the wicked flux will be eliminated when the wicked flux migrates up to the cavity 9. Therefore, the problem of flux wicking is overcome, and the conductivity of this embodiment of the modular jack in accordance the present invention is much improved. Referring to Figures 3 and 4, in an embodiment of a modular jack of the present invention, the housing 1 is provided with two diamond shaped mounting legs 4 at the bottom and two mounting ears 7 at the side walls. These diamond shaped mounting legs 4 are oriented so that the major axis of the first leg is oriented perpendicular to the axis of the second leg and these legs are adapted to be inserted into corresponding holes in the printed circuit board. The mounting ears 7 engage with the corresponding slits in the telephone set when the modular jack is secured to the telephone. According to an embodiment of a modular jack of the present invention, a plurality of recesses 8 are located close to terminal slots 6 at both sides to rectify dimensional variation caused by plastic shrinkage. The terminal slots 6 with the rectifying recesses 8 result in more precise positioning of the terminal part 5a of the contact pins 5 than the conventional art. The resultant position of the terminal part 5a of the contact pins 5 is closer to the nominal position as designed. As a consequence, the modular jack can be more easily and precisely mounted onto and soldered to the printed circuit board. According to an embodiment of a modular jack of the present invention., terminal slots 6 are constructed by two V- shape protrusions 6a at their neck area so that the round terminal part 5a of a contact pin 5 is more precisely positioned in the housing 1. The unique two V-shape protrusions 6a along with the rectifying recesses 8 also result in more precise positioning of the terminal part 5a of contact pins 5 than the conventional art. As shown in Figure 1, an embodiment of a modular jack in accordance with the present invention is integrated with a socket 2. The socket may be configured to be suitable for a number of different functions, for example, as a DC power socket, antenna socket or interface socket for another device. In an embodiment of a modular jack in accordance with the present invention, the socket is configured for use as a DC power socket. Figure 5 is a cross section of the modular jack along a line V-V in Figure 1, showing this configuration of socket 2, i.e., as a DC power socket in accordance with the present invention. With the integrated socket 2, a telephone set can be assembled faster. While only particular embodiments of the present invention have been shown and described herein, it will be appreciated that modifications thereof may be readily made thereto by those skilled in the art. We, therefore, intend by the appended claims to cover the modifications which fall within the true spirit and scope of the invention.

Claims: WHAT IS CLAIMED IS: 1. An electrical connector adapted to be mounted on a printed circuit board, comprising: an insulative housing having upper, front, and bottom surfaces; at least one plug inserting opening on said front surface of said housing for inserting a plug; a plurality of electrically conductive contact pins each of which is held in one of a plurality of terminal slots provided in said bottom surface of said housing, and a second contact part projecting within said plug inserting opening; and an area defining a cavity in said housing provided in a contact area between said housing and said contact pin wherein said cavity functions as a flux trap. 2. An electrical connector according to claim 1, wherein said terminal slots are V-shaped. 3. An electrical connector according to claim 2, wherein said V-shaped terminal slots are provided with two protrusions at their neck portions. 4. An electrical connector according to claim 1, wherein said area defining a cavity is provided between a channel and a terminal slot for said contact pin. 5. An electrical connector according to claim 1, further comprising: a plurality of rectifying recesses located adjacent to said terminal slots to rectify plastic shrinkage. 6. An electrical connector according to claim 1 wherein the area defining a cavity in said housing which functions as a flux trap is positioned between the slots and the plug inserting opening. 7. An electrical connector according to claim 1, further comprising: a socket integrated in said housing. 8. An electrical connector according to claim 7, wherein said socket is a DC power socket . 9. A modular jack adapted to be mounted on a printed circuit board, comprising: an insulative housing having upper, front, and bottom surfaces; at least one plug inserting opening on said front surface of said housing for inserting a plug; a plurality of electrically conductive contact pins each of which is held in one of a plurality of terminal slots provided in said bottom surface of said housing, and a second contact part projecting within said plug inserting opening; and an area defining a cavity in said housing provided in a contact area between said housing and said contact pin wherein said cavity functions as a flux trap. 10. A modular jack according to claim 9, wherein said terminal slots are V-shaped. 11. A modular jack according to claim 10, wherein said V-shaped terminal slots are provided with two protrusions at their neck portions. 12. An electrical connector comprising: a housing formed of an electrically insulative material; at least one electrically conductive contact extending in the housing, a portion of the contact being disposed in engagement with the housing, said housing engaging portion being adjacent a portion of the contact adapted to receive flux; and a cavity formed in the housing, said cavity being located in the area of engagement of the contact with the housing, to function as a contact flux trap. 13. An - electrical connector according to claim 12 wherein the portion of the contact adapted to receive flux extends over the cavity. 14. A modular jack comprising: a housing formed of an electrically insulative material; at least one electrically conductive contact extending in the housing, a portion of the contact being disposed in engagement with the housing, said housing engaging portion being adjacent a portion of the contact adapted to receive flux; and a cavity formed in the housing, said cavity being located in the area of engagement of the contact with the housing, to function as a contact flux trap. 15. A modular jack according to claim 14 wherein the portion of the contact adapted to receive flux extends over the cavity.

Inventors: TSAO JENN, TSAO, JENN
Applicants: BERG TECH INC, BERG TECHNOLOGY, INC.
Application year: 1994
Main classification: H01R4
IPC codes: H01R4, H01R12, H01R13